package book

import (
	"github.com/flipped-aurora/gin-vue-admin/server/global"
	"github.com/flipped-aurora/gin-vue-admin/server/model/book"
	bookReq "github.com/flipped-aurora/gin-vue-admin/server/model/book/request"
	bookRes "github.com/flipped-aurora/gin-vue-admin/server/model/book/response"
	commonReq "github.com/flipped-aurora/gin-vue-admin/server/model/common/request"
	"gorm.io/gorm"
)

type BookChapterService struct{}

const bookChapterDisplaySelect = "bc.*, b.title AS book_title"

func (s *BookChapterService) CreateBookChapter(item book.BookChapter) error {
	if err := validateBookChapter(item); err != nil {
		return err
	}
	return createWithExplicitIsEnabled(&item, item.IsEnabled)
}

func (s *BookChapterService) DeleteBookChapter(item book.BookChapter) error {
	return global.GVA_DB.Delete(&item).Error
}

func (s *BookChapterService) DeleteBookChapterByIds(ids commonReq.IdsReq) error {
	return deleteByIDs[book.BookChapter](ids.Ids)
}

func (s *BookChapterService) UpdateBookChapter(item book.BookChapter) error {
	if err := validateBookChapter(item); err != nil {
		return err
	}
	return global.GVA_DB.Save(&item).Error
}

func (s *BookChapterService) GetBookChapter(id uint) (item bookRes.BookChapterDisplay, err error) {
	err = bookChapterDisplayDB().
		Select(bookChapterDisplaySelect).
		Where("bc.id = ?", id).
		Take(&item).Error
	return
}

func (s *BookChapterService) GetBookChapterInfoList(info bookReq.BookChapterSearch) (list []bookRes.BookChapterListItem, total int64, err error) {
	db := bookChapterDisplayDB()
	if info.BookID != nil {
		db = db.Where("bc.book_id = ?", *info.BookID)
	}
	if info.IsReadable != nil {
		db = db.Where("bc.is_readable = ?", *info.IsReadable)
	}
	if info.IsEnabled != nil {
		db = db.Where("bc.is_enabled = ?", *info.IsEnabled)
	}
	if info.Keyword != "" {
		db = db.Where("bc.title LIKE ?", "%"+info.Keyword+"%")
	}
	err = db.Count(&total).Error
	if err != nil {
		return
	}
	err = db.Select(bookChapterDisplaySelect).Scopes(paginate(info.PageInfo)).Order("bc.book_id asc, bc.chapter_no asc").Scan(&list).Error
	return
}

func bookChapterDisplayDB() *gorm.DB {
	return global.GVA_DB.Table("book_chapter AS bc").
		Joins("LEFT JOIN book AS b ON b.id = bc.book_id")
}